- The definition of ruthless is someone without compassion or who doesn't show mercy.
An example of ruthless is someone running over a dog with their car on purpose.
ruthless definition by Webster's New World
without ruth; pitiless
Origin: Middle English reutheles
ruthless definition by American Heritage Dictionary
Having no compassion or pity; merciless: ruthless cruelty; ruthless opportunism.
- ruthˈless·ly adverb
- ruthˈless·ness noun